C Tutorial/stdio.h/fprintf

fprintf

Item Value Header

1. include <stdio.h>

Declaration int fprintf(FILE *stream, const char *format, ...); Function outputs the values to the stream. Return returns the number of characters actually printed on success or a negative number on failure.

The format control string are identical to those in printf();

<source lang="cpp">#include <stdio.h>

 #include <stdlib.h>
 int main(void)
 {
   FILE *fp;
   if((fp=fopen("test", "wb"))==NULL) {
     printf("Cannot open file.\n");
     exit(1);
   }
   fprintf(fp, "this is a test %d %f", 10, 20.01);
   fclose(fp);
   return 0;
 }</source>